I recently upgraded the iOs on my iPhone/iPad and am having trouble with OverDrive eBooks.

Restart your device. If this does not work, you may need to uninstall then reinstall OverDrive’s mobile app. This will clear your bookshelf, history, and app settings. You can save the list of titles in your history by going to Home Menu > History > Edit. Tap Select all, then Share. From there, you can email the list wherever you like. Read more